Summary:Refractory materials are a resource-based industry, raw materials are the basis of products, and natural mineral raw materials are the main body of refractory r
Refractory materials are a resource-based industry, raw materials are the basis of products, and natural mineral raw materials are the main body of refractory raw materials. my country’s refractory raw materials are rich in resources and varieties, such as silica, high alumina bauxite, refractory clay, magnesite, dolomite, pyrophyllite, graphite, three stones, zircon, chromite, olivine, kaolin, coal gangue, ball Clay, bentonite, etc. Among them, high alumina bauxite, magnesite and graphite rank among the top in the world in terms of reserves, grade and quality, and can be called three valuable resources at home and abroad.
1. Refractory Clay
Generally, clay with a refractoriness above 1580℃ is called refractory clay. my country has abundant refractory clay resources. According to its plasticity, it is divided into hard clay, semi-soft clay, soft clay and kaolin. All mines with high alumina bauxite buried have refractory clay buried, and the ore sites are widely distributed, such as Shandong (Jiaobao), Shanxi, Hebei, Guizhou, Sichuan and Guangxi (white mud), Jiangsu (Suzhou kaolin), Liaoning ( Zimu Festival, sticky bark), Jilin (Fraxinus mandshurica), Jiaozuo, Henan and other places.
Dolomite is a 1:1 double salt composed of magnesite (MgCO3) and calcite (CaCO3). It is the second largest alkaline refractory material after magnesite. It is mainly used to prepare dolomite refractory materials. Dolomite ore is first calcined (or fused) to obtain magnesia-calcium raw materials (such as dolomite sand/magnesia dolomite sand, magnesia-calcium sand, magnesia-calcium iron sand), and then prepared into various dolomite refractories.
Pyrophyllite is dehydrated slowly in the heating process. After dehydration, the structure is not destroyed, the volume is stable, and the raw material can be used to directly produce refractory materials. The dense block waxstone is sawn into the required shape and used as natural refractory stone.
Graphite has extremely high fire resistance. It has a melting point of 3850°C in a vacuum, has a slippery feel, and is resistant to corrosion by strong acids, alkalis and organic solvents. Graphite bricks, magnesia carbon bricks, aluminum carbon bricks, Al2O3-SiC-C castables, ramming materials and other graphite-containing refractories are widely used in important parts such as steel making and iron making.
Kaolin has high refractoriness, so it is often used to produce refractory materials. Refractory materials produced from kaolin are divided into clinker clay products and semi-acid clay products. Although some colored kaolin cannot be used as raw materials for ceramics and papermaking industries, they are good raw materials for making refractory materials and are of great significance to the comprehensive utilization of kaolin mines.
6. Coal Gangue
The main mineral composition of coal gangue is kaolin, quartz, montmorillonite, feldspar, limestone, etc., and its main chemical components are SiO2 and Al2O3, followed by MgO, CaO, Fe2O3 and P and S compounds. The use of coal gangue can produce semi-silica, clay, high alumina (mullite), corundum and silicon carbide refractories and monolithic refractories.
The clay mainly made of montmorillonite generally has strong water absorption and can absorb 8 times as much water as it is. After absorption, the volume expands 10 to 30 times. Among them, sodium-containing bentonite is called sodium bentonite, which has good adhesion and resistance. High temperature, good performance in refractory production.
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